Sophia Electric 12AU7 vs. Primaluna silver 12AU7
Received date: July 9, 2018
Wow! Just received a matched pair of the grade A Sophia 12au7's and they sound detailed with plenty of air around intruments with a slight warm tone and controlled bass. These were replacing the stock Primaluna silver 12au7's. The two front gain tubes in my Primaluna prologue premium integrated amplifier. Soundstage is wider and deeper with a 3 dimensional presentation on female vocals and jazz quartets. Thank you again for your great products and customer service. Sincerely John K."